[PATCH 9 of 9] largefiles: simplify iteration over standins

[Martin von Zweigbergk]

# HG changeset patch
# User Martin von Zweigbergk <martinvonz at gmail.com>
# Date 1410934239 25200
#      Tue Sep 16 23:10:39 2014 -0700
# Node ID 2cfc907f98e11ae2fbe8336c858a348ce2b5d1a7
# Parent  0e7f51097cdb5364b0fb45dcee38b9ffbf06ec16
largefiles: simplify iteration over standins

Instead of iterating over all files in the context and ignoring those
that are not standins, pass a standin-matcher to the context and
iterate over only the files matching.

Apart from making the intent clearer, this implementation will also
benefit from any future optimizations done to the manifest walking
code.

diff --git a/hgext/largefiles/reposetup.py b/hgext/largefiles/reposetup.py
--- a/hgext/largefiles/reposetup.py
+++ b/hgext/largefiles/reposetup.py
@@ -192,9 +192,7 @@
 
                     # Standins no longer found in lfdirstate has been
                     # removed
-                    for standin in ctx1.manifest():
-                        if not lfutil.isstandin(standin):
-                            continue
+                    for standin in ctx1.walk(lfutil.getstandinmatcher(self)):
                         lfile = lfutil.splitstandin(standin)
                         if not match(lfile):
                             continue